Roofing Glossary

Turbine Vent (Whirlybird)

Turbine vents — nicknamed whirlybirds — are the spinning, globe-shaped metal vents you see on many roofs. Wind spins the turbine, and the rotation pulls attic air up and out, exhausting heat and moisture even on calm days through natural convection.

Turbines move more air than static box vents when the wind blows, which makes them popular in hot climates. Their downsides: the spinning assembly eventually wears, seizes, or gets noisy; they can look industrial; and in high winds some designs can actually pull conditioned air from the house if the attic is not well sealed from the living space.

Like all exhaust vents, turbines need clear soffit intake to work properly — and they should not be mixed with ridge vents on the same attic.

Why It Matters

A seized, wobbling, or storm-damaged turbine is a leak and noise risk. If yours no longer spins freely, it is time to service or replace it — or upgrade to a ridge vent system during your next roof project.

Questions about your own roof? Request a free estimate or call Nucci Brothers Roofing at (301) 458-1003.